In the hypothetical fission reaction X 92 236 → Y a 144 + Z 36 b + 3 n 0 1 What are the values of a and b ?

Given reaction, X 92 236 → Y a 144 + Z 36 b + 3 n 0 1 From the atomic mass conservation 236 = 144 + b + 3 ⇒ b = 89 From the charge conservation 92 = a + 36 + 0 ⇒ a = 56

Consider the following nuclear reactions: I. 7 14 N + He 2 4 ⟶ O 8 17 + X II. Be 4 9 + H 2 4 ⟶ He 6 12 + Y Then,

X is a proton and Y is a neutron

X is a neutron and Y is a protron

MEDIUM

Earn 100

Write down the expression for Q value in the class of α decay.

Important Questions on Nuclear Physics

EASY

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

In the nuclear reaction

{}_{6}{C^{11}} \to_{9} B^{11} + β^{+} + X^{-}

, what does

X

stand for?

MEDIUM

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

A nucleus with mass number

184

initially at rest emits an

α -

particle. If the

Q

value of the reaction is

5.5 MeV,

calculate the kinetic energy of the

α -

particle.

EASY

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

The binding energy per nucleon of

{}_{3}L i^{7}

and

{}_{2}{He}^{4}

nuclei are

5.60 MeV

and

7.06 MeV,

respectively. Then, in the nuclear reaction

{{}_{3}L}^{7} + {{}_{1}H}^{1} ⟶ {}_{2}{He}^{4} + {}_{2}{He}^{4} + Q,

the value of

Q .

the energy released, is

MEDIUM

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

The

Q

-value of a nuclear reaction and kinetic energy of the projectile particle,

K_{p}

are related as

MEDIUM

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

On the bombardment of neutron with boron,

α

-particle is emitted. The product nuclei formed is

MEDIUM

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

Thermal neutrons at the room temperature have an energy of

0.025 eV .

Half-life of neutrons is

10

minutes. If a source gives out a beam of neutrons, at what distance from the source, half the neutrons would have decayed?

EASY

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

Which of the following nuclear reactions is possible?

EASY

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

The electric charge of the neutrino is given by

EASY

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

In the given nuclear reaction

${}_{4}^{9}B e + {}_{2}^{4}H e ⟶ {}_{6}^{12}C + X$ ,

$X$ represents....

EASY

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

The missing one $(?)$ in the following reaction is ${}^{9}B e + {}^{4}H e \to 3^{4} H e + ?$

HARD

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

A heavy nucleus

N

, at rest, undergoes fission

N \to P + Q,

where

P

and

Q

are two lighter nuclei. Let

δ = M_{N} - M_{P} - M_{Q}

, where

M_{P}, M_{Q}

and

M_{N}

are the masses of

P, Q

and

N

, respectively.

E_{P}

and

E_{Q}

are the kinetic energies of

P

and

Q

, respectively. The speeds of

P

and

Q

are

v_{P}

and

v_{Q}

, respectively. If

c

is the speed of light, which of the following statement(s) is (are) correct?

MEDIUM

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

A nucleus, initially at rest, breaks up into two nuclear fragments with their radii in the ratio

2 : 1 .

Then their velocities will be in the ratio

MEDIUM

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

In the hypothetical fission reaction

${}_{92}^{236}X \to {}_{a}^{144}Y + {}_{36}^{b}Z + 3 {}_{0}^{1}n$

What are the values of $a$ and $b$ ?

EASY

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

Consider the following nuclear reactions:

I. ${}_{7}^{14} N + {}_{2}^{4}{He} ⟶ {}_{8}^{17}O + X$

II. ${}_{4}^{9}{Be} + {}_{2}^{4}H ⟶ {}_{6}^{12}{He} + Y$

Then,

EASY

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

In the following nuclear reaction

{}_{6}C^{11} \to {}_{5}B^{11} - β^{-} - x, x

stands for

HARD

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

The minimum kinetic energy needed by an alpha particle to cause the nuclear reaction ${}_{7}^{16}N + {}_{2}^{4}{He} \to {}_{1}^{1}H + {}_{8}^{19}O$ in a laboratory frame is $n$ (in $MeV$ ). Assume that ${}_{7}^{16}N$ is at rest in the laboratory frame. The masses of ${}_{7}^{16}N, {}_{2}^{4}{He}, {}_{1}^{1}H$ and ${}_{8}^{19}O$ can be taken to be $16.006 u, 4.003 u$ , $1.008 u$ and $19.003 u$ , respectively, where $1 u = 930 MeV c^{- 2}$ . The value of $n$ is

If the numerical value has more than two decimal places, truncate/round-off the value to TWO decimal places.

EASY

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

A nuclear reaction is given as

{}_{2}{He}^{4} + {}_{Z}{X^{A}} \to {}_{Z + 2}{Y^{A + 3}} + A

. The particle

A

HARD

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

A nucleus of mass

M

emits

γ

-ray photon of frequency

v

. The loss of internal energy by the nucleus is: [Take

c

as the speed of electromagnetic wave]

MEDIUM

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

For nuclei with mass number close to

119

and

238

, the binding energies per nucleon are approximately

7.6 MeV

and

8.6 MeV

, respectively. If a nucleus of mass number

238

breaks into two nuclei of nearly equal masses, what will be the approximate amount of energy released in the process of fission?

HARD

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

Suppose a

{}_{88}^{226}{R a}

nucleus at rest and in ground state undergoes

α

-decay to a

{}_{86}^{222}{R n}

nucleus in its excited state. The kinetic energy of the emitted

α

particle is found to be

4.44 M e V . {}_{86}^{222}R n

nucleus then goes to its ground state by

γ

-decay. The energy of the emitted

γ

-photon is _______

k e V,

[Given: atomic mass of

_{88}^{226} R a = 226.005 u,

atomic mass of

_{86}^{222} R n = 222.000 u,

atomic mass of

α

particle

= 4.000 u, 1 u = 931 M e V / c^{2}, c

is speed of the light]

Write down the expression for Q value in the class of α decay.

Important Questions on Nuclear Physics

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